Feb 10 (Reuters) - Teenager Lydia Ko became the youngest winner of a women's European Tour golf event when she took victory at the New Zealand Women's Open in Christchurch on Sunday. The New Zealander cried with joy after winning her third professional title from 12 events at the age of 15 years, eight months and 17 days. "I didn't cry at the Canadian Open so I don't know why I cried here," Ko said. "I guess it meant more. It is our national open so to win means a lot. ...